Add uma tota default gateway com comando

Um comando show. rota e / ou manipular a tabela de roteamento IP em Linux e UNIX oses.

Rota manipula tabelas de roteamento IP do kernel. Seu principal uso é para configurar rotas estáticas para hosts ou redes específicas através de uma interface depois de ter sido configurado com o programa ifconfig. Quando o add ou del opções são usadas, rota modifica as tabelas de roteamento. Sem essas opções, route exibe o conteúdo atual das tabelas de roteamento.

Display default route

Following three-command display the current routing table:
# route
Output:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 ra0
default         dsl-router      0.0.0.0         UG    0      0        0 ra0

$ /sbin/route
Output:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
191.255.255.0   *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         191.255.255.1   0.0.0.0         UG    0      0        0 eth0

You can use -n option, to display numerical addresses instead of trying to determine symbolic host names (via dns or /etc/hosts file). This is useful if you are trying to determine why the route to your nameserver has vanished.$ /sbin/route -nOutput:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
191.255.255.0   0.0.0.0         255.255.255.0   U     0      0        0 venet0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 venet0
0.0.0.0         191.255.255.1   0.0.0.0         UG    0      0        0 venet0

Please note that a destionation entry 0.0.0.0 (or default) is the default gatway. In above example 191.255.255.1 is a default gatway.

Add / setup a new route

The syntax is as follows:
route add default gw {IP-ADDRESS} {INTERFACE-NAME}

Where,

• IP-ADDRESS: Specify router IP address
• INTERFACE-NAME: Specify interface name such as eth0

For example if your router IP address is 192.168.1.254 type the following command as the root user:
# route add default gw 192.168.1.254 eth0OR use hostname such as dsl-router:# route add default gw dsl-router eth0

Setting route using GUI tools/command under Linux

If you find above command hard to use, consider using GUI tools. If your are using Red Hat/CentOS/Fedora core Linux type following command:# redhat-config-networkOR If you are using other Linux distribution use command:# network-admin

http://www.cyberciti.biz/faq/linux-setup-default-gateway-with-route-command/